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12. BoilingHeatTransfer_2_web

12. BoilingHeatTransfer_2_web - ENU 4134 Boiling Heat...

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ENU 4134 – Boiling Heat Transfer – Part 2/3 D. Schubring October 18, 2010
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Outline I Introduction to pool and flow boiling I Nucleation superheat I Boiling incipience and bubble departure I Correlations for nucleate boiling heat transfer coefficient I Critical heat flux (CHF) mechanisms I CHF correlations I Film boiling correlations (post-CHF heat transfer)
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Learning Objectives I 2-c-i Identify and characterize the regimes of flow boiling and their relationships to flow regimes I 2-c-ii Select and implement appropriate boiling heat transfer correlations, with special emphasis given to complexity of correlation vs. time/resources available for analysis I 5-a Develop familiarity with terminology and mathematical symbols common to nuclear TH, including those symbols which do not map one-to-one to terminology I 5-b Use correlations and/or models to analyze problems in nuclear thermal hydraulics I 5-f Identify TH-related safety limits for light water reactor operation I 5-g Consider conservatism (or lack thereof) present in a model and evaluate implications of this for reactor safety analysis
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Correlations for Saturated Nucleate Boiling Once T bulk = T sat , essentially all heat transfer occurs in the form of phase change.
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